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Vermont Castings • Intrepid DV-IFT Owner’s Manual_R20 • 11/21
Installation Precautions
The DuraVent Direct Vent System is an engineered product
that has been designed and tested for use with an approved
list of direct vent gas appliances. The DuraVent warranty will
be voided, and serious fire, health or other safety hazards
may result from any of the following actions:
• Installation of any damaged Direct Vent component.
• Unauthorized modification of the Direct Vent System.
• Installation of any component part not manufactured
or approved by DuraVent.
• Installation other than as instructed by DuraVent and
the appliance manufacturer.
Consult your local building codes before beginning the
installation. Have the existing installation inspected by a
qualified chimney sweep or professional installer, prior to
converting to direct vent. The existing chimney system must
be in serviceable condition, and functionally sound.
The direct vent conversion described herein applies only
to factory-built metal ceiling-supported type systems
and masonry through-the-wall type systems. NOTE: You
cannot install a Conversion Kit in a through-the-wall type
factory-built metal chimney.
General Installation
Two different types of direct vent conversion systems are
described here. One is through an existing factory-built metal
chimney going through the ceiling. The other is through the
wall of an existing masonry chimney. Follow the appropriate
directions for your situation.
The concept of the direct vent conversion is to connect an
adapter to an Underwriters Laboratories listed 4” diameter
aluminum flex pipe (DuraVent’s DuraFlex is an example of
a UL listed flex pipe). The flex is then passed down through
the center of the existing metal chimney system. Three sizes
of termination caps are available which should fit most sizes
and makes of metal chimney systems. The Retro Connector
is then attached to the bottom of the flex pipe. Both the cap
adapter and retro connector are attached to the existing
chimney with sheet metal screws. The appliance is then
connected to the chimney with appropriate black direct vent
pipe and an adjustable length section.
There are several options to utilize an existing masonry
chimney using Co-Linear Vent Adapter or a flex liner. Refer to
Figure 3.54 for approved installations and venting components
required.
5. Pull the flex pipe down through the ceiling support box,
until it protrudes approximately 3” (76 mm). Connect the
flex pipe to the retro connector by slipping it into the 4-3/4"
(121 mm) diameter sleeve on the top side of the connector.
Use three (3) sheet metal screws to assemble these two
parts.
4. Pass the flex pipe down through the center of the chimney
system, and center the adapter on the top of the chimney
pipe. Drill four (4) 1/8” diameter holes through the adapter
and into the chimney top. Insure that you are in fact, drilling
into the metal on the chimney. Twist-lock the termination cap
(980, 991 or 930) onto the adapter, Figures 3.46 and 3.47.
Installation Instructions for Converting a Factory-Built
Metal Chimney
1. Remove the existing chimney cap.
2. Measure the distance from the top end of the chimney
to the bottom of the ceiling support box, add 3” to this
measurement and cut a section of 4” flex pipe to that
length (the flex should already be extended to its nominal
length).
3. Connect the end of the flex pipe section to the underside
of the cap adapter you have selected using three (3) sheet
metal screws, Figure 3.45.
ST957
flex pipe to cap
7/07
Sheet Metal
Screws
Flex Pipe
Top Adapter
Figure 3.45
ST958
cap onto adapter
7/07
Figure 3.46
ST959
cap to adapter
7/07
Termination Cap
Sheet Metal
Screws
Drill Four (4) 1/8”
Diameter Holes
Figure 3.47
